The moon is a satellite of the earth, the only one A large number 5 satellites in the solar system. The average distance from the earth from the center to the center, about 384403 kilometers, equivalent to 30 times the diameter of the world. The center of mass of the system is located at the joint position 1700 kilometers below the earth's surface, or about 1 in 4 of รัศมีของ world. The moon orbits around the earth in approximately 27.3 days [NB 1] compared variation period orbit followed standard Geography between Earth - Moon - the sun. Cause the phase of the moon, which is repeated every day around the 29.5 [NB 2] (called periods synode))
.The diameter of the moon, the 3474 kilometers [1], or about a quarter of the world. Therefore, the surface of the moon is less than 1 in 10 of the surface of the earth (about 1 in one 4 of continent of the world only. A large, about Russia, Canada and the United States together).2% earth's mass and gravity is 17% of the world.
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